Shielding Device Parasitic Capacitance Touch Sensitivity
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Solution Overview
Problem
Existing touch devices face challenges in achieving high touch sensitivity due to the parasitic capacitance between the sensing component and the substrate, which affects the detection of touch events and reduces the voltage difference necessary for accurate sensing.
Innovation Solution
A sensing device is designed with a shielding device that includes conductive components to distribute electrical energy and shield the substrate from the sensing component, reducing the effective capacitance and increasing the voltage difference for improved touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a sensing component is placed close to the substrate for compact design, then device area is reduced, but parasitic capacitance between the sensing component and substrate increases, reducing touch sensitivity
Solution Approach 1:
A shielding component is introduced as an intermediary element between the sensing component and the substrate. This shielding component acts as a mediator that blocks the parasitic capacitance formation while allowing the sensing component to maintain its close proximity to the substrate for compact design. The shielding component is electrically connected to the sensing component, creating a controlled capacitance path that eliminates unwanted parasitic effects.
2Measurement precision
If parasitic capacitance between sensing component and substrate is reduced to improve touch sensitivity, then voltage difference for touch detection increases, but device structure becomes more complex
Solution Approach 1:
The shielding component serves multiple functions simultaneously: it shields the sensing component from parasitic capacitance with the substrate, provides a reference voltage path, and maintains the compact structure. By making the shielding component electrically connected to the sensing component, it creates a multi-functional element that reduces complexity compared to having separate shielding and reference structures.
3Measurement precision
If shielding device is added to reduce parasitic capacitance and improve touch sensitivity, then measurement precision improves, but device complexity increases
Solution Approach 1:
The shielding component is merged with the sensing component through electrical connection, combining the shielding function with the sensing function into a unified structure. This merging approach reduces the number of separate components and simplifies the overall device architecture while maintaining the parasitic capacitance reduction benefit.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The shielding device enhances touch sensitivity by decreasing the capacitance between the sensing component and the substrate, making touch events easier to detect with a larger voltage difference, thereby improving the overall performance of the sensing device.
Implementation Method 1
The sensing component and the shielding device are configured to define a capacitance for storing electrical energy
Implementation Method 2
the parasitic capacitance between the sensing component and the substrate, which affects the detection of touch events
Implementation Method 3
The sensing component is configured to detect a touch capacitance in response to a touch event on the sensing device
Data Source
AI summary
A sensing device includes a substrate, a sensing component and a shielding device. The sensing component is configured to detect a touch capacitance in response to a touch event on the sensing device. The shielding device, between the substrate and the sensing component, is configured to distribute electrical energy, and shield the substrate from the sensing component.